int main(void){
	int a, b;
	printf("enter two numbers:");
	scanf("%d %d", &a, &b);

	int i;
	for(i=0;i<5230;i++){

	}
	printf("add:%d\n",add(a, b));
	printf("sub:%d\n",sub(a, b));
	printf("mul:%d\n",mul(a, b));
	printf("div:%d\n",div(a, b));
	return 0;
}
